<style>div { position:absolute; width:200px; height:200px; }</style>
<div style="background: radial-gradient(circle closest-side at 50px 80px, white, black); top:10px; left:10px;"></div>
<div style="background: radial-gradient(closest-side circle at 150px 80px, white, black); top:10px; left:220px;"></div>
<div style="background: radial-gradient(circle closest-side at 80px 50px, white, black); top:220px; left:10px;"></div>
<div style="background: radial-gradient(closest-side circle at 80px 150px, white, black); top:220px; left:220px;"></div>
<div style="background: radial-gradient(ellipse closest-side at 20px 40px, white, black); top:430px; left:10px;"></div>
<div style="background: radial-gradient(closest-side ellipse at 180px 40px, white, black); top:430px; left:220px;"></div>
<div style="background: radial-gradient(closest-side at 40px 20px, white, black); top:640px; left:10px;"></div>
<div style="background: radial-gradient(closest-side at 40px 180px, white, black); top:640px; left:220px;"></div>
